JPH0781125B2 - Metal reinforced panel and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a metal reinforced panel in which a metal plate (hereinafter often referred to as “panel plate”) and a reinforcing material are adhesively bonded with an acrylic adhesive, and the production thereof. Regarding the method.

(Prior Art and Problems Thereof) It is preferable to use a thick metal plate as a metal panel used for various structures from the viewpoint of preventing bending due to its own weight and deformation due to external stress. However, the use of a thick metal plate has drawbacks such as an increase in the cost of the metal plate and a reduction in work efficiency due to an increase in the weight of the metal plate. The one to which a shape reinforcing material is attached is used.

Conventionally, in the above-mentioned metal reinforced panel, one in which mechanical joining such as electric welding (mainly spot welding) or riveting is performed for joining the panel plate and the reinforcing material is generally used. However, the reinforced panel in which the panel plate and the reinforcing material are joined by these conventional methods has the following drawbacks.

Since stress concentrates on the joint, durability such as fatigue resistance and vibration resistance is not sufficient.

Traces of joining remain, making it difficult to apply to applications that require design and surface accuracy.

Special equipment or special skill is required to make the panel, and work efficiency is low.

In mechanical joining such as rivets, the airtightness of the joint is poor, and in order to cover this point, troublesome work such as applying a sealing agent to the joint is required.

On the other hand, various metal reinforced panels using adhesives have been devised and implemented as a joining method that does not leave a trace of joining with less stress concentration on the joining part, but the reliability of the adhesive strength of the adhesive used In many cases, it is not sufficient in terms of properties, workability of adhesion, and the like, and it has the disadvantage of limiting the range of use.

For example, in the case of a reinforcing panel in which a panel plate and a reinforcing material are joined together with an epoxy adhesive, the peel strength and impact strength of the adhesive cannot be said to be sufficient, and the joined portion is relatively easily peeled off by an external force. Because of fear, it was difficult to adapt to a large area panel and a place where a large external stress is applied. In addition, when using an epoxy adhesive in the production of a reinforcing panel, it is necessary to accurately measure and sufficiently mix the main agent and the curing agent, and if the measurement is inaccurate or if the mixing is insufficient, poor adhesion will result. Cause of. Further, since the epoxy-based adhesive generally has a slow curing speed, it takes a long time to obtain a desired strength, or it requires heating.

Further, JP-A-53-78240 and JP-A-56-46087 disclose a reinforcing panel using a room temperature-curing acrylic adhesive for joining a panel plate and a reinforcing material. Although the acrylic adhesive is a two-part adhesive, it does not require accurate measurement and sufficient mixing of the two parts, and it is a relatively rough measure and mix of the two parts (sometimes only contact of the two parts) at room temperature. Since it cures in a short time and has high peeling strength and impact strength, the reinforced panel using the acrylic adhesive for joining the panel board and the reinforcing material has excellent workability during manufacturing and durability of the panel itself. It also has the feature of being excellent in However, the acrylic adhesive has a drawback that its peeling strength and impact strength are lowered at extremely low temperatures, so that the above-mentioned reinforcing panel is used in applications where it is exposed to extremely low temperatures, such as outdoor structures and transport machines in cold regions. When it is used as an outer plate or the like, there is a risk that the joint portion will peel off due to an external force, and therefore, its use range was limited to a place where the use conditions were relatively mild, such as indoors.

The present invention has been made in view of these points, by joining the panel plate and the reinforcing material, by using an acrylic adhesive containing a specific component described below, stress concentration to the joint is low and low temperature. Also has excellent durability, has excellent designability because no trace of joining is left, has high airtightness, and has excellent workability when joining a panel plate and a reinforcing material, and a method for producing the same. The purpose is to provide.

(Means for Solving Problems) In the present invention, (1) an acrylate-based monomer and / or a methacrylate-based monomer and the amount of bound butadiene are 75% by weight.
A metal reinforcing panel in which a metal plate and a reinforcing agent are joined via a cured product of an acrylic adhesive containing the acrylonitrile-butadiene copolymer elastomer as a main component, and (2) a metal plate and a reinforcing material The acrylate-based monomer and / or methacrylate-based monomer and the bound butadiene layer are mainly composed of 75 wt% or more of acrylonitrile-butadiene copolymer elastomer, and promote the decomposition of organic peroxide and organic peroxide to generate radicals. The present invention relates to a method for producing a metal-reinforced panel, which comprises adhesively bonding with an acrylic adhesive that cures in the presence of a component for facilitating.

The acrylic adhesive used for joining the metal-reinforced panel of the present invention comprises an acrylate-based monomer and / or a methacrylate-based monomer and an acrylonitrile-butadiene copolymer elastomer (hereinafter often referred to as NRR) having a bound butadiene content of 75% by weight or more. It is a solution containing the main component, and these are cured by polymerization to give a strong adhesive force. The compositional characteristics of this acrylic adhesive are that NBR containing 75% by weight or more of bound butadiene in the elastomer contained as the main component of the adhesive for the purpose of improving peel strength and impact strength.
Is to use. When the amount of bound butadiene in NBR is less than 75% by weight, the adhesive strength (peeling strength, impact strength) at low temperatures is greatly reduced, and thus the durability of the reinforcing panel at low temperatures is reduced, thereby achieving the object of the present invention. I can't.

The preferred composition of the acrylic adhesive is 60 to 60% of the acrylate monomer and / or the methacrylate monomer.
NBR 5-40 with 95 wt% and bound butadiene content of 75 wt% or more
% By weight, containing these as the main components, and further containing an organic peroxide and a component (curing accelerator) that accelerates the decomposition of the organic peroxide and facilitates the generation of radicals. The amount of the organic peroxide and the curing accelerator is sufficient to polymerize and cure the monomer component in the adhesive, but usually 100
1 to 10 parts by weight of organic peroxide, and 0.
Used from 1 to 10 parts by weight.

Examples of the acrylate-based monomer and the methacrylate-based monomer include methyl acrylate, acrylate ester,
Propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, 2-hydroxyethyl methacrylate.
Examples thereof include 3-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate, cyclohexyl methacrylate and glycidyl methacrylate.

The organic peroxide in the present invention has a function of a so-called radical polymerization initiator, for example, benzoyl peroxide, methyl ester ketone hydroperoxide, t
-Butyl hydroperoxide, di-t-butyl hydroperoxide, dicumyl peroxide, cumene hydroperoxide, paramenthane hydroperoxide and the like can be mentioned.

Examples of the curing accelerator in the present invention include metallic soaps such as cobalt naphthenate, dimethyl-P-toluidine, diethyl-P-toluidine, and diisopropanol-.
P-toluidine or thiourea, acetylthiourea,
Examples thereof include tetramethylthiourea, ethylenethiourea, and thioamide compounds such as mercaptobenzimidazole.

The acrylic adhesive used in the present invention may contain other monomers in addition to the acrylate-based monomer and / or the methacrylate-based monomer, if necessary, but the content of the acrylic adhesive should be 10% by weight or less in the adhesive. Is preferred.

Further, it is possible to use various polymers other than the main component NBR and various additives usually used in adhesives, and 50% by weight or less is preferable in the adhesive.

The acrylic adhesive used in the present invention is composed of two liquids A and B, both liquid A and liquid B contain an acrylate monomer and / or a methacrylate monomer, and one of the liquids contains an organic peroxide. A so-called two-part liquid containing an oxide and a curing accelerator in one of the other liquids, and NBR in at least one of the liquids A and B, and other components in the liquids A and / or B if desired. A main agent type adhesive and a primer consisting of either an organic peroxide or a curing accelerator dissolved in itself or in an organic solvent or monomer such as acetone, methanol or ethanol, and an organic peroxide or a curing accelerator. Acrylate-based monomer and / or methacrylate-based monomer, NB with one of the other agents
There is a primer type adhesive composed of R and a main agent containing other components as required. These adhesives cure at room temperature due to the adhesion of the two liquids.

The material of the panel plate and the reinforcing material used in the present invention is not limited, but aluminum and its alloys,
Typical examples are steel, various kinds of plated or coated surface-treated steel, and stainless steel. Further, the panel plate and the reinforcing material may be made of the same material or may be made of different materials.

As the shape of the reinforcing material, there are representative ones such as A, B, C and D shown in FIG. 1, but the shape is not limited to these.

In the present invention, the acrylate-based monomer and / or the methacrylate-based monomer by bonding the above-mentioned metal panel plate and the reinforcing material, and the amount of bound butadiene is 75 wt% or more at room temperature containing an acrylonitrile-butadiene copolymer elastomer as a main component. A curable acrylic adhesive is used.

As a method for adhering the panel plate and the reinforcing material, any of the following methods a) to c) may be used in consideration of the type of the acrylic adhesive, the area of the adhered surface and the like.

A) In the case of a two-component base agent type adhesive consisting of the base agent A and the base agent B (No. 1), the base agent A of the acrylic adhesive is applied to either the flat panel or the adhering surface of the reinforcing material and the other adhering surface After applying the main agent B separately, the adherends are overlapped with each other, and if necessary, pressurized and allowed to stand for a predetermined time (more than the adhesive fixing time).

(B) In the case of a two-component base agent type adhesive consisting of the base agent A and the base agent B (2), a liquid in which the base agent A and the base agent B are mixed is applied to one of the flat panel panel and the adhering surface of the reinforcing material and bonded Overlay the other surface to be adhered within the pot life of the agent (pot life).
Like the above, leave still for a predetermined time.

C) In the case of a primer-type adhesive, the main agent is applied to either one of the flat panel panel or the adherend of the reinforcing material, and the primer containing the accelerator or organic peroxide is separately applied to the other adherend. When a solvent is contained, the solvent is evaporated and dried, and then the adherends are placed on top of each other and left to stand for a predetermined time in the same manner as in a) and b).

(Examples) Hereinafter, the present invention will be described with reference to Examples, but all parts in the specification represent parts by weight.

[Example-1 and Comparative Example-1] The acrylic adhesives listed in Table 1 were blended, and the performance of the adhesives was measured and shown in Table 2.

Using these adhesives, reinforcing panels made of aluminum alloy having the shapes shown in FIGS. 2, 3, and 4 were produced.
The materials of the panel plate a and the reinforcing materials b, b ′, b ″ are the symbols A-5052 and A-606 specified in JISH-400, respectively.
It was 1, and both adherend surfaces were subjected to sand plast treatment in advance. The bonding method is to apply the main agent A to the adhered surface of the panel board and the main agent B to the adhered surface of the reinforcing material,
Both adherends were superposed. The pressure method is per square centimeter
A load of 0.2 kg was applied for 20 minutes. The working temperature was 25 ° C.

Place the reinforcing panel thus prepared on the concrete floor with the side with the reinforcing material attached,
From a height of 1 m, drop a 1 kg steel ball to the center of the panel,
The number of steel ball drops required to separate the flat panel and the reinforcing material was measured. The results are shown in Table 3.

[Comparative Example-2] A two-component epoxy adhesive (cemedine # 15
00, manufactured by Cemedine Co., Ltd.
Weighed 1: 1, mixed well, then applied to the adherend surface of the reinforcing plate and laminated with the flat panel, except that the adhesive was cured at 80 ° C for 50 minutes to obtain the same reinforcing panel as in Example-1. make,
The same falling ball impact test as in Example-1 was performed. The results are shown in Table 3.

The performance of the adhesive was measured by the following test method.

(1) Measurement of Fixing Time An iron material was used as a test piece, an adhesive was applied and mixed and bonded to a 1-inch square surface at room temperature, and a tensile load of 5 kg was applied to measure the time until the test piece did not shift.

(2) Measurement of adhesive strength Peel (T peel) strength is ASTM-D
-1876-61T, and impact strength was measured by ASTM-D-950-54, respectively. The test pieces used were iron sandblasted products.

[Example-2 and Comparative Example-3] Acrylic adhesives listed in Table 4 were blended, and the performance of this adhesive was measured, and shown in Table 5.

The results show that NBR containing 73% by weight of bound butadiene.
In the case of using, the adhesion performance at low temperatures such as -20 ° C, -30 ° C, and -40 ° C was poor, and the object of the present invention could not be achieved.

[Brief description of drawings]

A, B, C, and D in FIG. 1 are schematic views showing examples of the shape of the reinforcing material, and the hatched portions are joint surfaces. FIG. 2 is a rear perspective view showing an embodiment of the metal reinforcing panel according to the present invention, in which a is a panel plate, b, b ′,
b ″ are reinforcing members having the same shape. FIG. 3 is a side view of the panel, and FIG. 4 is an enlarged view of a portion C surrounded by a dotted line in FIGS. 2 and 3. d is an adhesive layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-18773 (JP, A) JP-B 53-24103 (JP, B2) JP-B 54-28178 (JP, B2) "Synthetic rubber processing technology" Whole book ▲ Maru 5 ▼ Nitrile rubber "published by Taiseisha, pp. 7-10, 1976

Claims (2)

[Claims] 1. A metal plate via a cured product of an acrylic adhesive mainly composed of an acrylate-based monomer and / or a methacrylate-based monomer and a bound butadiene content of 75% by weight or more of an acrylonitrile-butadiene copolymer elastomer. A metal reinforced panel made by joining reinforcing materials. 2. A metal plate and a reinforcing material, an acrylate-based monomer and / or a methacrylate-based monomer, and an acrylonitrile-butadiene copolymer elastomer whose bound butadiene layer is 75% by weight or more as a main component, and an organic peroxide. A method for producing a metal-reinforced panel, which comprises adhesively bonding with an acrylic adhesive that is cured in the presence of a component that accelerates the decomposition of organic peroxide and facilitates the generation of radicals.